oaknut-filesystem
The pluggable filesystem contract for the oaknut family — the base every Acorn (and, in principle, foreign) filesystem plugs into.
A filesystem is the unit of extension: Acorn DFS, Watford DFS, Opus DDOS,
ADFS, AFS, … are peers, registered on the oaknut.filesystem entry-point axis
(built on oaknut-extension). Each one:
- probes an image region and proposes what it is — with a confidence, evidence, and a candidate geometry;
- opens a region into a mount exposing a small core (list / stat /
read / write / exists, and parsing its own path syntax) plus opt-in
capability protocols (
HierarchicalDirectories,AcornMetadata,BootOption,UserDatabase,RegionHost); - declares its geometry grammar — the physical layouts it supports.
Two concerns are kept strictly apart:
- Geometry — the physical mapping of image bytes to logical sectors
(track count, sides, interleave, density, CHS). This is the discimage
DiscFormatlayer, beneath the filesystem. - Filesystem — the logical structure that turns sectors into files and directories.
This package also hosts the identification coordinator (identify()): it
runs the registered filesystems over an image, ranks the candidates, and
recurses into reserved regions (an ADFS host's tail, where an AFS or other
filesystem may live) to produce a per-partition Identification tree.
It depends on no concrete filesystem package and imports none: filesystems are discovered purely through entry points, so any subset can be installed and the rest simply aren't handled.
See docs/dev/filesystem-extensions.md (architecture) and
docs/dev/filesystem-extensions-plan.md (implementation plan).
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